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| Auteurs principaux: | , , , |
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| Format: | Preprint |
| Publié: |
2024
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| Accès en ligne: | https://arxiv.org/abs/2406.00273 |
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| _version_ | 1866916269248217088 |
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| author | Clocchiatti, Alejandro Rodríguez, Ósmar Morales, Ariel Órdenes Cuevas-Tapia, Benjamín |
| author_facet | Clocchiatti, Alejandro Rodríguez, Ósmar Morales, Ariel Órdenes Cuevas-Tapia, Benjamín |
| contents | An analysis of the Cosmological Constant $Ω_Λ$ fitted to subsamples of the Pantheon+ Type Ia SN sample spanning 2$π$ sterradians for a grid of 432 pole positions covering the whole sky reveals two large scale asymmetries. One of them is closely aligned with the Galactic North-South direction and the other points approximately towards RA$\sim 217.5^\circ$ Dec$\sim -26.4^\circ$, $\sim$50.9 degrees from the CMB dipole Apex. The signal to noise ratio (S/N) of the multiple $Ω_Λ$ measurements in these directions is $3.2\lesssim $ S/N $\lesssim 8.4$. The first asymmetry is puzzling, and would indicate a systematic effect related with the distribution of Pantheon+ SNe on the sky and, probably, how the correction for reddening in the Galaxy is calculated. The second one, which entails a 2.8-$σ$ tension between $Ω_Λ$ measure in opposite directions, bears strong implications on its interpretation as Dark Energy: It is consistent with the prediction for tilted observers located in a Friedmann-Robertson-Walker universe who could measure an acceleration or a deceleration with a dipolar asymmetry, irrespective of what the universe as a whole is doing. In this case, $Ω_Λ$ would not be a physical entity, a real Dark Energy, but an apparent effect associated with the relativistic frame of reference transformation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_00273 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Global Anisotropies of $Ω_Λ$ Clocchiatti, Alejandro Rodríguez, Ósmar Morales, Ariel Órdenes Cuevas-Tapia, Benjamín Cosmology and Nongalactic Astrophysics An analysis of the Cosmological Constant $Ω_Λ$ fitted to subsamples of the Pantheon+ Type Ia SN sample spanning 2$π$ sterradians for a grid of 432 pole positions covering the whole sky reveals two large scale asymmetries. One of them is closely aligned with the Galactic North-South direction and the other points approximately towards RA$\sim 217.5^\circ$ Dec$\sim -26.4^\circ$, $\sim$50.9 degrees from the CMB dipole Apex. The signal to noise ratio (S/N) of the multiple $Ω_Λ$ measurements in these directions is $3.2\lesssim $ S/N $\lesssim 8.4$. The first asymmetry is puzzling, and would indicate a systematic effect related with the distribution of Pantheon+ SNe on the sky and, probably, how the correction for reddening in the Galaxy is calculated. The second one, which entails a 2.8-$σ$ tension between $Ω_Λ$ measure in opposite directions, bears strong implications on its interpretation as Dark Energy: It is consistent with the prediction for tilted observers located in a Friedmann-Robertson-Walker universe who could measure an acceleration or a deceleration with a dipolar asymmetry, irrespective of what the universe as a whole is doing. In this case, $Ω_Λ$ would not be a physical entity, a real Dark Energy, but an apparent effect associated with the relativistic frame of reference transformation. |
| title | Global Anisotropies of $Ω_Λ$ |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2406.00273 |